Eric brown

You will need a printer who has either a large cylinder press (Heidleberg or similar) or a large proofing press, maybe a Western, as the half tones are quite large a platen type machine wil not be powerful enough to either ink sufficiently or produce a good print quality.

I have met but not visited Glasgow Press www.glasgowpress.co.uk and they are letterpress, with, I think, a large enough machine. You could enquire with them, as they do work on the 'commercial' end of the scale, so might have experience with halftones.